Over the course of their evolutionary histories, the timing of flowering, the spacing of plants, and the nectar rewards of flowering plants have influenced the foraging behavior of bees, which in turn has influenced the morphology of flowers
This process is an example of
A) competitive exclusion.
B) convergent evolution.
C) adaptive radiation.
D) niche partitioning.
E) coevolution.
E
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Hawkmoths are most likely to be attracted to flowers
that a. have red and yellow patterned petals. b. emit foul odors. c. have UV light reflective petals. d. have large, showy flowers. e. emit strong odors.
Which of the following contributes to the stability of the DNA double helix?
A) hydrophobic interactions between aromatic bases at the center of the double helix B) hydrogen bonding between the phosphate and sugar groups in the backbone of the double helix C) covalent bonding between complementary purine and pyrimidine bases. D) ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases. E) hydrophobic interactions between aromatic bases at the center of the double helix and ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases
The main advantage of YAC (yeast artificial chromosome) over other vectors in cloning human genes
is that A. it is taken up more readily by recipient cells. B. it is larger. C. it is less likely to trigger rejection. D. it is made of human DNA. E. it has unique restriction sites.
In a certain population, the allele frequencies of the M and N blood group alleles are 0.6 and 0.4,
respectively. How many of a population of 500 would be expected to have MN blood type if the population is in genetic equilibrium for the MN locus? a. 200 b. 220 c. 240 d. 260 e. 300